docker-util: Update the gcn-gpu docker image Cloud Bucket

This is updated for the gem5 v21.1 release.

Change-Id: I84e663afdca41045a73e2fc25b87b53a6063202c
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/48663
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util/dockerfiles/gcn-gpu/Dockerfile

diff --git a/util/dockerfiles/gcn-gpu/Dockerfile b/util/dockerfiles/gcn-gpu/Dockerfile
index 360ab1f..b307996 100644
--- a/util/dockerfiles/gcn-gpu/Dockerfile
+++ b/util/dockerfiles/gcn-gpu/Dockerfile
@@ -70,7 +70,7 @@
 
 WORKDIR /ROCclr
 # The patch allows us to avoid building blit kernels on-the-fly in gem5
-RUN wget -q -O - dist.gem5.org/dist/develop/rocm_patches/ROCclr.patch | git apply -v
+RUN wget -q -O - dist.gem5.org/dist/v21-1/rocm_patches/ROCclr.patch | git apply -v
 
 WORKDIR /ROCclr/build
 RUN cmake -DOPENCL_DIR="/ROCm-OpenCL-Runtime" \